Diagnosis Procedure

1. Turn the ignition switch OFF.
2. Disconnect 4WAS main control unit harness connector.
3. Check the voltage between 4WAS main control unit harness connector terminal and the ground.
   CONNECTOR TERMINAL VOLTAGE CHART
   
   

   4WAS main control unit		Voltage (Approx.)
   Connector	Terminal
   B54	27 - Ground	0 V

4. Turn the ignition switch ON.
   CAUTION: Never start the engine.
5. Check the voltage between 4WAS main control unit harness connector terminal and the ground.
   CONNECTOR TERMINAL VOLTAGE CHART
   
   

   4WAS main control unit		Voltage (Approx.)
   Connector	Terminal
   B54	27 - Ground	Battery voltage

   Is the inspection result normal? 

   YES: GO TO 2.

   NG: Check the following items. Repair or replace the malfunctioning parts.

   • 10A fuse (#45) open
     • Short among 10A fuse (#45) connector, 4WAS main control unit harness connector No. 27 terminal and the ground
   • Open between the ignition switch and 4WAS main control unit harness connector No. 27 terminal
   • Ignition switch

Check the continuity between 4WAS main control unit harness connector and the ground.

Is the inspection result normal? 

YES: GO TO 3.

NG: Repair or replace the harnesses and connectors.

With CONSULT-III 

1. Connect 4WAS main control unit harness connector.
2. Perform 4WAS main control unit self-diagnosis.

   Is DTC "C1909" detected? 

   YES: Replace 4WAS main control unit. Refer to "EXPLODED VIEW ".

   NO: GO TO 4.

With CONSULT-III 

Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. Refer to "REFERENCE VALUE ".

Is each data the standard value? 

YES: Check each harness connector pin terminal for disconnection.

NO: Replace 4WAS main control unit. Refer to "EXPLODED VIEW ".